Doorbell



FIG. 1 is a front elevational view of a doorbell in a power off state; showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front perspective view thereof;

FIG. 8 is a rear perspective view thereof; and,

FIG. 9 is a perspective view of the doorbell in a power-on state, showing two illuminated lights in a circular area of the doorbell.

The broken lines in the figures illustrate portions of the doorbell that form no part of the claimed design. 

CLAIM The ornamental design for a doorbell, as shown and described. 